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Open AccessArticle

Accuracy Evaluation of Videogrammetry Using A Low-Cost Spherical Camera for Narrow Architectural Heritage: An Observational Study with Variable Baselines and Blur Filters

by 1,* and 2
1
School of Architecture, Nanjing Tech University, Nanjing 211800, China
2
School of Architecture, Southeast University, Nanjing 210096, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(3), 496; https://doi.org/10.3390/s19030496
Received: 29 December 2018 / Revised: 23 January 2019 / Accepted: 23 January 2019 / Published: 25 January 2019
(This article belongs to the Special Issue Geophysics and Remote Sensing in Archaeology and Monumental Heritage)
Three-dimensional (3D) reconstruction using video frames extracted from spherical cameras introduces an innovative measurement method in narrow scenes of architectural heritage, but the accuracy of 3D models and their correlations with frame extraction ratios and blur filters are yet to be evaluated. This article addresses these issues for two narrow scenes of architectural heritage that are distinctive in layout, surface material, and lighting conditions. The videos captured with a hand-held spherical camera (30 frames per second) are extracted to frames with various ratios starting from 10 and increasing every 10 frames (10, 20, …, n). Two different blur assessment methods are employed for comparative analyses. Ground truth models obtained from terrestrial laser scanning and photogrammetry are employed for assessing the accuracy of 3D models from different groups. The results show that the relative accuracy (median absolute errors/object dimensions) of spherical-camera videogrammetry range from 1/500 to 1/2000, catering to the surveying and mapping of architectural heritage with medium accuracy and resolution. Sparser baselines (the length between neighboring image pairs) do not necessarily generate higher accuracy than those from denser baselines, and an optimal frame network should consider the essential completeness of complex components and potential degeneracy cases. Substituting blur frames with adjacent sharp frames could reduce global errors by 5–15%. View Full-Text
Keywords: spherical camera; videogrammetry; baseline; narrow architectural heritage; 3D reconstruction; point cloud spherical camera; videogrammetry; baseline; narrow architectural heritage; 3D reconstruction; point cloud
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MDPI and ACS Style

Sun, Z.; Zhang, Y. Accuracy Evaluation of Videogrammetry Using A Low-Cost Spherical Camera for Narrow Architectural Heritage: An Observational Study with Variable Baselines and Blur Filters. Sensors 2019, 19, 496. https://doi.org/10.3390/s19030496

AMA Style

Sun Z, Zhang Y. Accuracy Evaluation of Videogrammetry Using A Low-Cost Spherical Camera for Narrow Architectural Heritage: An Observational Study with Variable Baselines and Blur Filters. Sensors. 2019; 19(3):496. https://doi.org/10.3390/s19030496

Chicago/Turabian Style

Sun, Zheng; Zhang, Yingying. 2019. "Accuracy Evaluation of Videogrammetry Using A Low-Cost Spherical Camera for Narrow Architectural Heritage: An Observational Study with Variable Baselines and Blur Filters" Sensors 19, no. 3: 496. https://doi.org/10.3390/s19030496

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